Thread: Help needed: Sky Watcher 10" Dob can only focus on very close objects
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Old 05-02-2017, 04:11 PM
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Merlin66 (Ken)
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Join Date: Oct 2005
Location: Junortoun Vic
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Ian,
I'd hazard a guess that the 90mm difference is to accommodate the difference between visual and getting enough back focus to fit a camera.
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